Connected: An Internet Encyclopedia
RFC 821 - GLOSSARY

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### GLOSSARY

       ASCII

          American Standard Code for Information Interchange [1].

       command

          A request for a mail service action sent by the sender-SMTP to the
          receiver-SMTP.

       domain

          The hierarchially structured global character string address of a
          host computer in the mail system.

       end of mail data indication

          A special sequence of characters that indicates the end of the
          mail data.  In particular, the five characters carriage return,
          line feed, period, carriage return, line feed, in that order.

       host

          A computer in the internetwork environment on which mailboxes or
          SMTP processes reside.

       line

          A a sequence of ASCII characters ending with a <CRLF>.

       mail data

          A sequence of ASCII characters of arbitrary length, which conforms
          to the standard set in the Standard for the Format of ARPA
          Internet Text Messages (RFC 822 [2]).

       mailbox

          A character string (address) which identifies a user to whom mail
          is to be sent.  Mailbox normally consists of the host and user
          specifications.  The standard mailbox naming convention is defined
          to be "user@domain".  Additionally, the "container" in which mail
          is stored.

       receiver-SMTP process

          A process which transfers mail in cooperation with a sender-SMTP
          process.  It waits for a connection to be established via the
          transport service.  It receives SMTP commands from the
          sender-SMTP, sends replies, and performs the specified operations.

       reply

          A reply is an acknowledgment (positive or negative) sent from
          receiver to sender via the transmission channel in response to a
          command.  The general form of a reply is a completion code
          (including error codes) followed by a text string.  The codes are
          for use by programs and the text is usually intended for human
          users.

       sender-SMTP process

          A process which transfers mail in cooperation with a receiver-SMTP
          process.  A local language may be used in the user interface
          command/reply dialogue.  The sender-SMTP initiates the transport
          service connection.  It initiates SMTP commands, receives replies,
          and governs the transfer of mail.

       session

          The set of exchanges that occur while the transmission channel is
          open.

       transaction

          The set of exchanges required for one message to be transmitted
          for one or more recipients.

       transmission channel

          A full-duplex communication path between a sender-SMTP and a
          receiver-SMTP for the exchange of commands, replies, and mail
          text.

       transport service

          Any reliable stream-oriented data communication services.  For
          example, NCP, TCP, NITS.

       user

          A human being (or a process on behalf of a human being) wishing to
          obtain mail transfer service.  In addition, a recipient of
          computer mail.

       word

          A sequence of printing characters.

       <CRLF>

          The characters carriage return and line feed (in that order).

       <SP>

          The space character.

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Connected: An Internet Encyclopedia
RFC 821 - GLOSSARY